Pilot signals for large active retrodirective arrays
Journal Article
·
· Space Sol. Power Rev.; (United States)
OSTI ID:5749401
It has been suggested that for large active retrodirective arrays, as in the solar power system, a two-tone uplink pilot signal with frequencies symmetrically situated around the downlink frequency be used in order to reduce ionospheric biases and to lower the cost since a two-tone receiver is much cheaper than a single-tone phase-locked receiver. Unfortunately, such a system now faces the following well-known difficulties: (i) the ..pi..-ambiguity, (ii) a phase difference between the downlink and uplink signals. It is shown how the ..pi..-ambiguity can be easily removed by using a two-tone uplink signal with both frequencies situated at one side of a downlink frequency, and the phase difference can be greatly reduced with a three-tone or a four-tone uplink pilot signal.
- Research Organization:
- Univ. of Alabama, Huntsville
- OSTI ID:
- 5749401
- Journal Information:
- Space Sol. Power Rev.; (United States), Journal Name: Space Sol. Power Rev.; (United States) Vol. 2:4; ISSN SSPRD
- Country of Publication:
- United States
- Language:
- English
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